1 weld-01 (High - Low 、高 -低) 2 welld-02 (Incomplete Root Fusion 、根部未熔合 ) 3 welld-03 (Insuffucient R einforcement 、内凹 ) 4 welld-04 (Excess Root Penetration 、根部焊瘤 ) welld-05 5 (External Undercut 、外部咬肉 ) welld-06 6 (Internal Undercut 、内部咬肉 ) welld-07 7 (Root Concavi t y、根部凹陷 ) (Root Concavi t y、根部凹陷 ) welld-08 8 (Burn Through 、烧穿 ) (Burn Through 、烧穿 ) welld-09 9 (Isolated Slag